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From: tmorris@convex.UUCP
Newsgroups: net.auto.tech
Subject: Re: Vapor Lock
Message-ID: <94400003@convex>
Date: Mon, 25-Nov-85 10:19:00 EST
Article-I.D.: convex.94400003
Posted: Mon Nov 25 10:19:00 1985
Date-Received: Thu, 28-Nov-85 03:14:57 EST
References: <2922@vax4.fluke.UUCP>
Lines: 22
Nf-ID: #R:vax4.fluke.UUCP:2922:convex:94400003:000:1322
Nf-From: convex.UUCP!tmorris    Nov 25 09:19:00 1985


	Heres a major disagreement ! As a former GM tech , let me inform you
that vapor lock is alive and well and living in Z-28 Camaros with H.O. engines.
It occurs previous to the fuel pump , where the METAL fuel lines are close to
the exhaust system. On a hot day , take one of these things out and do several
good acceleration runs (like on an expressway ramp in traffic ) . Then when
you stop at a light and idle for about a minute , take off and try again.
You will RUN OUT OF GAS at about 3500 rpm in second gear. Let off the foot-feed
for a second and everything will be ok .
	IF you test the fuel pump pressure , you will find it to be ok .
If you check the fuel flow volume , you will find it more than sufficient. If 
you move the fuel lines away from the exhaust , it will cure the problem !
	Another nasty side effect of poor design is that the car will flood
and set a code 45 on the computer after being shut off HOT and restarted after
about 15 minutes . I have read fuel pressures that are excessive under those 
conditions , as the pressurized tank reaches 5 to 7 psi before the vent lets 
it escape , and then the efficient fuel pump drives it up the rest of the way.
	The float can't handle it , and the carb floods at idle. Again , moving
the fuel lines does it .


					tmorris@convex ,disclaim,disclaim !